Hanna Instruments HI520 User manual

INSTRUCTION MANUAL
Hanna Instruments Inc., 584 Park East Drive, Woonsocket, RI 02895 USA www.hannainst.com
HI520
Multiparameter Platform
Dual‑Channel Universal Process Controller

Dear Customer,
Thank you for choosing a Hanna Instruments®product.
Please read this instruction manual carefully before using this instrument as it provides the necessary information
for correct use of this instrument, as well as a precise idea of its versatility.
This manual has been written for HI520 Dual‑Channel Process Controller with software version v1.00 and higher.
It contains information that applies to setup, installation, and operation of HI520‑0320 or HI520‑0540 controller
paired with probes from following configurable series:
Configurable probe*series Parameter
HI10x6‑y8zz
HI1026‑1803
HI1126‑1805
pH
pH Meat
pH General Food Applications
HI20x4‑y8zz ORP
HI7630‑y8zz Conductivity
HI7640‑18zz Galvanic Dissolved Oxygen
HI7640‑58zz Optical Dissolved Oxygen
* Sold separately. Refer to probe manuals for specifications, installation, and application fields.
x, y, zz configurable options. See 2.2 Supported Probe Series Configurations for details.
If you need additional technical information, do not hesitate to e‑mail us at [email protected].
Visit www.hannainst.com for more information about Hanna Instruments and our products.
All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner,
Hanna Instruments Inc., Woonsocket, Rhode Island, 02895, USA. Hanna Instruments reserves the right to modify the design,
construction, or appearance of its products without advance notice.

TABLE OF CONTENTS
1. Introduction .............................................................4
1.1. Preliminary Examination ............................... 4
1.2. Safety Measures .......................................... 4
1.3. General Description & Intended Use ............... 5
2. Specifications...........................................................8
2.1. Controller ................................................... 8
2.2. Supported Probe Series Configurations ......... 10
3. Controller Basics.....................................................11
3.1. Front Panel ................................................ 11
3.2. Contextual Help ......................................... 13
3.3. Icons & Functions ....................................... 13
3.4. USB‑C Port ................................................ 14
3.5. Measurement Screens ................................. 15
4. Installation & Controller Start‑Up.............................17
4.1. Installation Hardware ................................. 17
4.2. Wiring ...................................................... 24
4.3. Starting‑Up the Controller ........................... 31
5. Controller Setup – Menu Structure ...........................32
6. Channel.................................................................33
6.1. Probe Settings Navigation .......................... 33
6.2. Probe Settings, General Parameters .............. 34
6.3. (Process) Control & Alarm Settings ............... 36
7. Hold Mode.............................................................46
7.1. Turning On Manual Hold ............................. 46
7.2. Configuring External Hold Trigger ................. 46
8. Math Channel.........................................................48
8.1. Math Channel Setup ................................... 48
8.2. Math Channel Measurement ........................ 49
9. Sequential Control ..................................................49
10. Outputs ...............................................................49
10.1. Relays ..................................................... 50
10.2. Analog Outputs ........................................ 51
11. Inputs..................................................................54
12. Cleaning..............................................................56
12.1. Advanced Cleaning ................................... 59
12.2. Simple Cleaning ....................................... 60
13. Technical Menu ....................................................60
13.1. Pressure Calibration .................................. 61
13.2. Analog Output Calibration ......................... 62
13.3. Firmware Update ..................................... 62
14. Manual Mode.......................................................63
15. Log Recall............................................................64
15.1. Measurement Log Files ............................ 64
15.2. Event Log & Event Log Types ..................... 66
16. General Settings...................................................73
17. Functioning Modes & Process Variables...................82
18. Control Modes & Algorithms...................................84
19. Cleaning Mode...................................................101
19.1. Overview of Cleaning Types ..................... 101
19.2. Cleaning Block Inputs & Outputs ............. 102
19.3. Cleaning Sequences ............................... 102
19.4. Cleaning Algorithms ............................... 103
19.5. Cleaning Triggers ................................... 104
19.6. Stop Cleaning ........................................ 105
20. HI520 Events Management System......................107
21. Measuring with pH & ORP Probes.........................114
21.1. General Installation Considerations .......... 114
21.2. Installation Schemes & Mounting ............ 114
21.3. Configurable Measurement Parameters .... 118
21.4. Calibration ............................................ 119
21.5. Conditioning & Maintenance ................... 125
22. Measuring with EC Probes....................................126
22.1. General Installation Considerations .......... 126
22.2. Installation Schemes & Mounting ............ 126
22.3. Configurable Measurement Parameters .... 129
22.4. Calibration ........................................... 132
22.5. Maintenance ......................................... 137
23. Measuring with Galvanic DO Probes......................138
23.1. Probe Preparation & Conditioning ............ 138
23.2. General Installation Considerations .......... 139
23.3. Installation Schemes & Mounting ............ 139
23.4. Configurable Measurement Parameters .... 142
23.5. Calibration ............................................ 144
23.6. Maintenance ......................................... 147
24. Measuring with Optical DO Probes........................148
24.1. Probe Preparation & Conditioning ............ 148
24.2. General Installation Considerations .......... 149
24.3. Installation Schemes & Mounting ............ 149
24.4. Configurable Measurement Parameters .... 151
24.5. Calibration ............................................ 153
25. Modbus Remote Control ......................................158
25.1. Modbus Wiring ...................................... 158
25.2. Operating Modes When Using Modbus ..... 158
25.3. Setup .................................................... 159
26. Troubleshooting Guide.........................................160
27. Application Configuration ....................................161
28. Accessories.........................................................162
28.1. pH Calibration Solutions ......................... 162
28.2. ORP Solutions ........................................ 162
28.3. Conductivity Solutions ............................ 162
28.4. DO Solutions & Accessories ..................... 162
28.5. Electrode Storage Solutions ..................... 162
28.6. Electrode Cleaning Solutions ................... 163
28.7. Patch Cables .......................................... 163
28.8. Electrode Holders ................................... 163
28.9. Flow Cell Saddle and Fittings .................. 165
28.10. Mounting Kit Accessories ....................... 166
29. Annex................................................................169
29.1. Buffer Values at Various Temperatures ..... 169
29.2. Glossary ................................................ 170
29.3. List of Figures ........................................ 171
Certification...............................................................173
Recommendations for Users........................................173
Warranty ..................................................................173

Introduction 4
1. INTRODUCTION
1.1. PRELIMINARY EXAMINATION
Remove the instrument and accessories from the packaging and examine it carefully.
For further assistance, please contact your local Hanna Instruments office or email us at [email protected].
Each unit is supplied with:
• Power cable, 3 m (9.84’) long
• Set of cable gland seals
• Instrument quality certificate
• Quick reference guide with QR code for user manual download
Mounting kits for supported installations are sold separately.
Note: Save all packing material until you are sure that the instrument works correctly. Any damaged or
defective item must be returned in its original packing material with the supplied accessories.
1.2. SAFETY MEASURES
General Safety Precautions & Preliminary Installation Recommendations
Procedures and instructions detailed in this section may require special precautions to ensure the safety of the
personnel performing the operations.
• Electrical connection, installation, start‑up, operation and maintenance must be carried out by specialized personnel only.
• The specialized personnel must have read and understood the instructions in this manual and should adhere to them.
• User serviceable connections are all accessible inside the enclosure.
• Do not operate or energize the instrument with the case open.
• Before powering the controller, verify wiring has been done properly.
• Always disconnect the instrument from power when making electrical connections.
• Do not run other cables through the same cable gland with the power cable.
• A clearly marked disconnect switch must be installed in the vicinity of the instrument to ensure that the electrical circuit
is completely de‑energized for service or maintenance.
• Do not operate damaged instruments which could pose a danger.
• Damaged instruments should be clearly marked as faulty and replaced.
• If faults cannot be repaired, the instrument must be taken out of service and secured against unintentional start‑up.
Built‑in Safety Features
• All electrical connections enclosed in an IP65 rated enclosure
• Galvanic isolation for all inputs and outputs
• EMC (electromagnetic compliant) hardware and software design
Notes:
•If system faults or a power failure occurs, a fault-signaling contact triggers the alarm.
•The HI520 controller has been tested for EMC in industrial use according to radiated emissions.
•Wiring or wiring changes (i.e. Probe, Relays, RS-485 communication port, Inputs, Outputs) must be carried
out after the controller has been turned off from power.

5 Introduction
1.3. GENERAL DESCRIPTION & INTENDED USE
HI520 of the first dual‑input process controller Hanna Instruments®that accepts virtually any combination of
compatible probes.
Designed to adapt to unique process control requirements, HI520 operates a control‑loop system whereby users
have the option to run channel control independently or configure to be triggered sequentially upon reaching
the other channel's set point(s) (1, 2, or both).
The device operates a logical channel with built‑in mathematical functions. This function is intended for when
the controller works as an analyzer for monitoring high/low parameter levels between two identical input types
with identical measurement configurations.
Standardized main unit and mounting accessories (compatible with a variety of installations), plug and play
operation with all supported probes, secure and waterproof connections between controller and probe make
HI520 unit a versatile multiparameter platform.
The controller can be configured for a wide range of applications requiring control and monitoring of four main
water‑analysis parameters: pH, ORP, Conductivity, and Dissolved Oxygen and is suitable for wall‑, pipe‑, and
panel‑mounting installations.
The unit has a low profile vulcanized rubber keypad for all operations, blue LEDs to indicate when relays are
energized, multi‑color LEDs for detailed inspection of status.
The RS‑485 interface to probe, remote control and monitoring ports are EMI protected. Safety features include
fuse‑protected relays and a hold‑to‑safe‑values mode.
An intuitive interface for control setup, relay activation, alarm signaling (hold status) and the help and diagnostic
feature, guide users to identify problems and suggest possible action(s) to be taken.
Configuring control parameters can be done locally or remotely using the Modbus protocol and a compatible
Modbus server.
Shared‑function management
Smart technology enables optimization of probes for specific applications, such as different temperatures,
measurement modes, or ranges. When paired up, the system allows for shared management of settings between
controller and probes, where the controller manages only settings related to the intended application, as defined
by the requirements of the industrial process, and the probes manage measurement settings and warnings,
including temperature compensation and calibration.

Introduction 6
Main Features
Process input •
Smart probes with RS‑485 connection. Automatic probe recognition and upload of
configuration calibration, and measurement data.
User interface • Easily navigable main menu and submenus
Analog Outputs
(programmable)
• Two or four, depending on the controller model
`0 –20 mA
`4 –20 mA
Alarm Relay • Activates on errors and programmable alarm conditions
Control relays
(programmable)
•
Three (two SPDT + one SPST) or five (two SPDT + three SPST) contact outputs,
depending on the controller model
`5 A –250 Vac
`5 A –30 Vdc
Cleaning function
• Integral water or chemical cleaner control
• Configurable simple or advanced cleaning:
`triggered manually
`triggered at a set time interval
`scheduled for a specific day of the week
`triggered by a digital input
• Blowers, water jets, washers (user supplied)
LCD display • Backlit dot matrix
• With virtual key function
Enclosure • Rugged molded housing with hinged front panel
Additional Features
Hold mode • Automatic mode for entering calibration, Setup, and cleaning cycle
• Manually triggered or triggered via an external digital input
h key • User help key, opens a guide for diagnosing a problem or troubleshooting
Security access code • Protected calibration and setup settings
Languages • English (default), Deutsch, Español, Français, Italiano, Magyar, Nederlands,
Português
Remote control • Monitor and control of process parameters through RS‑485 (Modbus RTU)
USB‑C port • USB for exporting (or importing) data with a flash drive and for software update
Manual mode
• Used to exercise relays and analog outputs
• Useful for:
`setting up the system
`priming a pump
`checking wiring
`during general maintenance
• Default option when the industrial application requires manual input
•
As a safety feature, a 60‑minutes timeout to exit manual mode is implemented (relays
and analog outputs return to their previous value)

7 Introduction
Data & Event logger
• The controller automatically logs the process control information in an interval
log, and various event alarms and errors in an event log
•
Logged data can be retrieved and events visualized on the screen, in Log Recall menu
• Interval logs store up to 8600 records per lot, maximum lot number is 100 lots
• Logging interval can be set in the General settings menu
• Logged data includes:
`measurement variables and temperature measurements
`last calibration data
`setup configuration
`start/end date and time
`previous values
`event data and event code
• Event log can store up to 100 records of events, alarms, errors‑related data
• Log files can be uploaded to a USB flash drive via USB‑C port
Calibration
• pH
Up to three‑points standard calibration with selection from two buffer groups:
`Hanna Instruments: 1.68, 4.01, 7.01, 10.01, 12.45 pH
`NIST: 1.68, 4.01, 6.86, 9.18, 12.45 pH
• Conductivity
Up to two‑points user calibration with selectable calibration points:
`0.000 μS/cm for offset
`84.0 μS/cm, 1413 μS/cm, 5.00 mS/cm,12.88 mS/cm for 0.1/cm cell
`80.0 mS/cm, 111.8 mS/cm additional standards for 1.0/cm cell
• DO (Dissolved Oxygen)
Up to two‑points standard calibration
• Single point process calibration for all supported parameters
•
Last calibration data stored on the probe and can be visualized in the Cal Data window
• Calibration reminder can be scheduled (1 to 99 days) or set as Off
Safety • When in Setup or Calibration mode, without making any changes or pressing any
key, the controller will return to Measure mode and restart control.

Specications 8
2. SPECIFICATIONS
2.1. CONTROLLER
Model Relays Analog Outputs
HI520‑0320 3 2
HI520‑0540 5 4
2.1.1. Specifications
Supported
digital probes
• pH
`HI1006‑18 (LT, PTFE junction)
`HI1016‑18 (LT, ceramic junction)
`HI1006‑38 (HT, PTFE junction)
`HI1016‑38 (HT, ceramic junction)
`HI1006‑48 (HF, PTFE junction)
`HI1016‑48 (HF, ceramic junction)
`HI1026‑1803 (meat applications only)
`HI1126‑1805 (general food applications)
• ORP
`HI2004‑18 (platinum sensor, PTFE junction)
`HI2014‑18 (platinum sensor, ceramic junction)
`HI2004‑28 (gold sensor, PTFE junction)
`HI2014‑28 (gold sensor, ceramic junction)
• conductivity
`HI7630‑28 (two‑electrode cell)
`HI7630‑48 (four‑ring, platinum on glass)
• galvanic Dissolved Oxygen
`HI7640‑18
• optical Dissolved Oxygen
`HI7640‑58
Display Graphic LCD, 128 × 64 pixel B/W with backlight
Digital inputs 2 independent, galvanically isolated inputs, configurable for Hold & Cleaning functions
On state: 5 to 24 Vdc, low or high level active

9 Specications
Analog outputs
2 or 4 independent outputs
0 –22 mA configurable as:
`0 –20 mA
`4 –20 mA
`22 mA as alarm signal
Analog output accuracy ±0.2 % f.s.
Digital
communication
• RS‑485 serial port for remote monitoring and control (Modbus)
• USB‑C port to retrieve log files and firmware upgrading
Relays
Up to 5 relays, independently configurable for process variables, Hold and Cleaning
functions
Electromechanical relay outputs
5 A –250 Vac; 5 A –30 Vdc (resistive load)
Fuse protected: 5 A, 250 V slow blow fuse
Alarm relay for all
measurement alarms
Electromechanical relay SPDT contact output
5 A –250 Vac; 5 A –30 Vdc (resistive load)
Fuse protected: 5 A, 250 V slow blow fuse
Data logging
• Interval log, up to 100 files, maximum 8600 records on each stored file.
When the maximum limit is reached, the most recent file will automatically erase
the oldest one.
• Event log, maximum 100 records.
When the maximum limit is reached, the last record overwrites the oldest one.
Power supply 100 –240 Vac ±10 %; 50/60 Hz; 15 VA;
fuse protected (2 A, 250 V slow blow fuse)
Power consumption 15 VA
Installation category II
Enclosure* Single case ½ DIN, IP65 ingress protection
Weight Approximately 1.6 kg (3.5 lb.)
Dimensions
Width 144.0 mm (5.7”)
Height 144.0 mm (5.7”)
Depth 151.3 mm (6.0”)
Environment –20 to 50 °C (–4 to 122 °F); maximum 100 % RH non‑condensing
* For a water tight seal, tighten the four front casing screws to 13.3 lbf•in (1.5 N•m, max. 2.0 N•m), of torque.

Specications 10
2.2. SUPPORTED PROBE SERIES CONFIGURATIONS
HI10 x x –y8z z pH
xx 06 PolyTetraFluoro‑Ethylene (PTFE) junction
16 Ceramic junction
y
1Low Temperature (LT) glass sensor, titanium matching pin
–5.0 to 80.0 °C (23.0 to 176.0 °F) 0.00 to 12.00 pH
3High Temperature (HT) glass sensor, titanium matching pin
0.0 to 100.0 °C (32.0 to 212.0 °F) 0.00 to 14.00 pH
4Fluoride‑resistant (HF) glass sensor, titanium matching pin
–5.0 to 60.0 °C (23.0 to 140.0 °F) 0.00 to 10.00 pH
HI20 x x –y8z z Oxidation‑Reduction Potential (ORP)
xx 04 PolytetraFluoro‑Ethylene (PTFE) junction
14 Ceramic junction
y
1Platinum sensor
–5.0 to 100.0 °C (23.0 to 212.0 °F) ±2000 mV
2Gold sensor
–5.0 to 100.0 °C (23.0 to 212.0 °F) ±2000 mV
HI7630 –y8z z Conductivity (EC)
y
2
Two‑electrode cell conductivity, AISI 316 stainless
steel, cell constant k ≈ 0.1/cm
0.0 to 50.0 °C (32.0 to 122.0 °F)
EC 0.000 μS/cm to 30.00 mS/cm
TDS 0.000 mg/L to 15.00 g/L (TDS factor 0.5)
RES 34 Ω•cm to 99.99 MΩ•cm
4
Four‑ring conductivity, platinum on glass,
cell constant k ≈ 1.0/cm
0.0 to 100.0 °C (32.0 to 212.0 °F)
EC 0.0 μS/cm to 999.9 mS/cm
TDS 0.0 mg/L to 400.0 g/L (TDS factor 0.5)
RES 1.00 Ω•cm to 9.99 MΩ•cm
Seawater Salinity 400.0 %NaCl, 42 psu, 80 ppt
HI7640 –1 8 z z Galvanic Dissolved Oxygen
1Galvanic sensor
−5.0 to 50.0 °C (23.0 to 122.0 °F)
Concentration 0.00 to 50.00 mg/L (ppm)
Saturation 0.0 to 500.0 %
HI7640 –5 8 z z Optical Dissolved Oxygen
5Optical sensor
−5.0 to 50.0 °C (23.0 to 122.0 °F)
Concentration 0.00 to 50.00 mg/L (ppm)
Saturation 0.0 to 500.0 %
8Smart probe, with RS‑485 connection
zz 00 supplied with DIN connector (without cable). See 28 Accessories section for cable ordering codes.
05, 10,15, 25, 50 cable length (meters)

11 Controller Basics
3. CONTROLLER BASICS
3.1. FRONT PANEL
• The front panel includes a graphic display and keypad with tactile feedback
• Two LEDs, ALARM and STATUS, indicate alarm and status conditions
• HOLD LED lights up yellow indicating controller HOLD status
• Depending on the model, up to five additional LEDs light up blue, indicating relay status
?
DIAG
HOLD
STATUS
ALARM
REL 1
REL 2
REL 3
REL 4
REL 5
°C
25. 0
mV
401
Ф
°C
25.0
pH
6.43
УБ
pH & ORP
8
1
2
7
5
6
4
3
Figure 1: Front Panel & Keypad Description
Front Panel & Keypad
1Alarm & Control relay LEDs
2Graphic Display (LCD)
3 Keypad
4Cable glands
5Hold LED
6USB‑C Port
7Status LED
8Captive spring loaded screws

Controller Basics 12
3.1.1. LCD Display Functions
Screenshots below show typical examples of measurement screen areas for readings taken with two wired probes.
CH1 displays pH measurement data and CH2 displays conductivity (EC) measurement data.
Notes:
•Units for measured value change, depending on wired probe.
•For conductivity measurements, the controller displays the temperature compensation mode status.
1 2
3
4
5
6
З
LIN.
M
Ф
ББ
У
а
6.43
91.03
25.0
12.0
pH
μS/cm
°C
°C
pH & EC
Man
У
Б
б
6.84
25.0
pH
°C
Measure pH
7
8
З
LIN.
У
Б
а
91.03
12.0
μS/cm
°C
Measure EC
10
9
Figure 2: Display Description
3.1.2. Keypad
There are six functional keys and three virtual keys that change function with the display above.
Functional Keys
• m direct Menu key
Permits access to calibration and Setup parameters.
• h direct diagnostic/help key
Opens a guide for Setup or diagnosing a problem or troubleshooting.
• b back functional key
Returns the user to previous hierarchical menu level.
Performs an exit or escape function.
• udr directional arrow keys
Move the user through the menu and submenu in either direction.
May be used to increment one position.
May be used to move continuously through a menu or string of values by holding the key in the depressed position.
1Title and status area
2а warning & б alarm icons. Press the h
(diagnostic key) for description.
3
Channel number CH1/CH2
Бactive channel icon
Press rto display alternative units.
4CH1 reading area
5CH2 reading area
6Temperature reading (value, unit, and alarm status)
Temperature alarm status, З (low) or Ж (high)
7Temperature source status (Probe or Manual)
8Temperature compensation mode (EC probes only)
9Warning symbol
10 Virtual key option

13 Controller Basics
Virtual Keys
• o o o
Perform the functions displayed on the bottom of the display screen.
Used to set or modify parameters values or to access, export, or delete log files.
3.2. CONTEXTUAL HELP
HI520 offers an interactive contextual help mode that assists the user at any time.
• Press h (diagnostic key) to access the help screen.
The instrument will display additional information related to the current screen.
• Use the ud keys to scroll the text to read all the available information.
• Press b (back key) to exit help mode. The controller returns to the previous screen.
3.3. ICONS & FUNCTIONS
Symbol Example Function
bA warning symbol that requires user consent.
aA warning symbol asking the user to be patient as information is saved
(or reverted) inside the probe and updated.
е
ё
Displayed in the top right corner of the title & status area, indicates
instrument password protection status.
аБ
Ф
У
а
6.43
401
25.0
25.0
pH
mV
°C
°C
pH & ORP
Displayed in the middle of the title and status area, indicates a warning.
Press h (diagnostic key) for a description and suggested action.
бБ
Ф
У
б
6.43
401
25.0
25.0
pH
mV
°C
°C
pH & ORP Displayed in the title and status area, indicates an active alarm or error
state.
Press h (diagnostic key) for a description and suggested action.

Controller Basics 14
Symbol Example Function
Ж
Ж
Ф
Б
б
7.37
50.1
pH
°C
Measure pH
Displayed next to the reading (e.g. temperature reading),
indicates Alarm High on the parameter.
З
З
Ф
Б
б
7.43
0.0
pH
°C
Measure pH
Displayed next to the reading (e.g. temperature reading),
indicates Alarm Low on the parameter.
cFatal error screen.
Press hand follow the displayed instructions.
ЙБ
Ф
У
Йа
6.43
401
25.0
25.0
pH
mV
°C
°C
pH & ORP
The controller is connected remotely via RS‑485 to a Modbus server.
ЛБ
Ф
У
Ла
6.43
401
25.0
25.0
pH
mV
°C
°C
pH & ORP
The controller is connected remotely via RS‑485 to a Modbus server
and is in Remote Edit Mode.
3.4. USB‑C PORT
The USB‑C port is located on the right side of the controller.
Users can connect a USB flash‑drive (directly or through an adapter) or a cable to this port.
Note: The flash drive should not be pulled out of the USB-C port while it is still in operation.
USB
1
32
1USB‑C port
2Cable glands
3Venting element
Figure 3: Side View: USB‑C Port & Venting Element

15 Controller Basics
3.5. MEASUREMENT SCREENS
Measure is the normal operating mode. With probe connected, controller automatically detects probe type.
Screenshots below display sensor measurement data – value, unit, temperature compensation type –
taken with pH, ORP, Conductivity, and Dissolved Oxygen probes.
Connected probe Measure type Dual & single channel display modes
pH pH Б
Ф
У
6.43
7.01
25.0
19.2
pH
pH
°C
°C
pH & pH
Ф
Б7.01
19.2
pH
°C
Measure pH
ORP ORP Б
Ф
У
921
401
25.0
25.0
mV
mV
°C
°C
ORP & ORP
Ф
Б401
25.0
mV
°C
Measure ORP
Conductivity
EC LIN.
Б
Ф
У
6.43
91.03
25.0
19.0
pH
μS/cm
°C
°C
pH & EC
LIN.
Ф
Б91.03
19.0
μS/cm
°C
Measure EC
TDS LIN.
Б
Ф
У
6.43
45.54
25.0
19.0
pH
ppm
°C
°C
pH & TDS
LIN.
Ф
Б45.54
19.0
ppm
°C
Measure TDS
Resistivity STD.
Б
Ф
У
6.43
18.0
25.0
25.0
pH
MΩ•cm
°C
°C
pH & RES
STD.
Ф
Б18.0
25.0
MΩ•cm
°C
Measure RES
Sal % Б
Ф
У
6.43
0.1
25.0
19.0
pH
Sal %
°C
°C
pH & SAL
Ф
Б0.1
19.0
Sal %
°C
Measure SAL
Sal ppt Б
Ф
У
6.43
0.08
25.0
25.0
pH
ppt
°C
°C
pH & SAL
Ф
Б0.08
25.0
ppt
°C
Measure SAL
Sal psu Б
Ф
У
6.43
0.67
25.0
25.0
pH
psu
°C
°C
pH & SAL
Ф
Б0.67
25.0
psu
°C
Measure SAL
Dissolved Oxygen
(DO)
DO_Conc Б
Ф
У
6.43
7.28
25.0
25.1
pH
mg/L
°C
°C
pH & DO
Ф
Б7.28
25.1
mg/L
°C
Measure DO
DO_%Sat Б
Ф
У
6.43
99.7
25.0
25.1
pH
%Sat
°C
°C
pH & DO
Ф
Б99.7
25.1
%Sat
°C
Measure DO

Controller Basics 16
3.5.1. Selecting Measure Channel
The default display mode is dual‑channel view. The controller remembers last selected mode upon restart.
• Press the ud keys to select channel.
The Б symbol indicates active channel.
STD.
Ф
ББ
У
6.43
2.580
25.0
25.0
pH
μS/cm
°C
°C
pH & EC
STD.
Б
Ф
У
6.43
2.580
41
25.0
pH
μS/cm
mV
°C
pH & EC
• Press the rto display alternative measure units (e.g. mV for pH or EC for TDS)
STD.
Ф
ББ
У
6.43
2.580
25.0
25.0
pH
μS/cm
°C
°C
pH & EC
• Press the dkey with CH2 selected for single‑channel display (CH1, CH2, or Math).
STD.
У
Б141.7
25.0
μS/cm
°C
Measure EC
STD.
Ф
Б2.580
25.0
μS/cm
°C
Measure EC
Difference:
Math
Б
139.1μS/cm
Measure EC
• Press the d key with Math channel active (or CH2 if Math not available) to return to the dual‑channel view.

17 Installation & Controller Start-Up
4. INSTALLATION & CONTROLLER START‑UP
4.1. INSTALLATION HARDWARE
4.1.1. Guidelines
•
The controller is suitable for outdoor use, but installation in direct sunlight or in areas of extreme temperature
is not recommended.
•
Based on controller specifications, installation thermal conditions are in the –20 to 50 °C (–4 to 122 °F) range.
• The controller should be installed in an area where vibrations and electromagnetic interference are minimized.
• Unused cable conduit entries must be securely sealed with Type 4X or IP66 conduit plugs, to maintain the
ingress protection rating.
• Easy access to the controller should be available at all times.
• Safety precautions must be observed at all times! See 1.2 Safety Measures section for details.
• The versatile enclosure design supports surface or wall‑, panel‑, and pipe‑mount installations.
4.1.2. Wall Mount (Surface Mount)
Wall‑Mount Support Surface & Inside Depth Dimensions
• horizontal mount requires at least 208 mm (8.2“) wall support surface
• vertical mount requires at least 108 mm (4.3“) wall support surface
?
DIAG
170 mm [6.7”]
280 mm [8.2”]
34 mm [1.3”]
85 mm [3.3”]
160 mm [6.3”]
Figure 4: Wall‑Mount Panel, Slots Dimensions

Installation & Controller Start-Up 18
85 mm [3.3”]
83 mm [3.3”]
34 mm [1.3”]
108 mm [4.3”]
83 mm [3.3”]
280 mm [8.2”]
12 mm [0.5”]
170 mm [6.7”]
Ø 6.2 mm [ 0.244”]Ø 8.5 mm [ 0.335”]
Figure 5: Wall‑Mount Panel Thickness, Mounting Bolts & Slots Dimensions
The minimum depth required by a unit fastened to a 12 mm (0.5“) mounting plate is 163 mm (6.4”).
163 mm [6.4”]
Figure 6: HI520 Controller Fastened to Wall‑Mount Panel

19 Installation & Controller Start-Up
Wall‑Mount Hardware & Steps
The controller can be mounted on a wall using a Wall‑Mount panel that can be fixed either horizontally or vertically.
Use the Wall‑Mount panel with appropriate hardware. See table, description column, for details.
The mounting kit does not include the fasteners required for attaching the Wall‑Mount panel to the wall.
Fasteners type and length selection must be based on wall type i.e. concrete, brick, metal, wood as well as
wall thickness.
Note: The four slots in the Wall-Mount plate are for user-supplied mounting fasteners between Ø 6.0 mm
(1/4”) and Ø 8.0 mm (5/16”).
1 32 4 5
Figure 7: Wall‑Mount Schematic
Wall‑Mount Hardware
Label Description Quantity
1Process controller 1 pc.
2Zinc‑plated, Wall‑Mount panel 1 pc.
3Plain washer for M6 screw 4 pcs.
4Spring washer for M6 screw 4 pcs.
5M6 × 12 mm screw (DIN 7985) 4 pcs.

Installation & Controller Start-Up 20
To wall mount the controller:
1. Select the position desired for the controller and following the dimensions indicated in Figure 5, drill the
holes required for attaching the Wall‑Mount panel to the surface. The drill size depends on the fasteners
dimension required by wall type and thickness.
2.
Fasten the Wall‑Mount panel to the controller following Figure 7 schematic, and using supplied screws
and washers.
3. Fasten the mounting panel to the wall (surface), using four bolts.
4. For horizontal wall mount, use a leveling tool to adjust the controller in correct horizontal position.
4.1.3. Panel Mount
Inside Depth, Width & Height Dimensions
• 122 mm (4.80”) minimum inside depth i.e. the dimension it extends behind the panel
• 138 mm (5.4“) width x 138 mm (5.4“) height
• panel thickness can go up to 10 mm (0.39“), depending on material
11 mm [0.433”]
160 mm [6.3”]
38 mm [1.5”]
Figure 8: Panel Mount, Inside Depth
45°
138 mm 0
+1 5.43” 0.00 +0.04
138 mm 0
+1 5.43” 0.00
+0.04
5 mm [0.2”]
Figure 9: Panel Mount Cutout